On Thu, 14 May 2009 21:37:12 -0600 (MDT) "M. Warner Losh" <i...@bsdimp.com> mentioned:
> In message: <200905122114.n4cleag9033...@svn.freebsd.org> > Stanislav Sedov <s...@freebsd.org> writes: > : @@ -926,6 +937,7 @@ atestart_locked(struct ifnet *ifp) > : * tell the hardware to xmit the packet. > : */ > : WR4(sc, ETH_TAR, segs[0].ds_addr); > : + BARRIER(sc, ETH_TAR, 8, BUS_SPACE_BARRIER_WRITE); > : WR4(sc, ETH_TCR, segs[0].ds_len); > > Why is a barrier needed here? > Writing the TCR register triggers the transmit, so it had to be written strongly after the TAR register. That's why I added the barrier here. -- Stanislav Sedov ST4096-RIPE !DSPAM:4a0cfbe4994295595297431! _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
